Hello P.Cip,
The logs indicate that the DisplayPort link cannot "train". This is a part where the sender and receiver send specific known patterns and, based on error level, decide at which speed they will talk.
This is generally the sign of a bad connection, the link, and different from being unable to read the monitor identification details I initially thought about.
Could it be possible for you to try an alternative DisplayPort cable?
If this doesn't work, we will need to proceed with purchasing a HP Z27i monitor.
Kind regards,
Alban
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